The Abbey, Annandale, Gothic mansion in Annandale, Australia.

The Abbey is a two-storey brick house at 272 Johnston Street, Annandale, built in a variation of the Victorian Free Gothic style. It has a tower with gargoyles, a Gothic vault, stencil work, hand-painted panels and timber architraves. John Young used reinforced concrete in its construction, an innovation at the time.

John Young, who migrated from England and worked as a builder in Melbourne before settling in Sydney, bought land at Annandale in 1877 and built The Abbey as the most outstanding of eight houses along a ridge near Rozelle Bay. Completed in 1882, it was intended to persuade his wife to return from England; she never did, and the couple never lived there. In 1924 the house was subdivided into flats, beginning a long decline, and in 1959 radio engineer Lancelot Davis bought it for £4,500 for his son Geoffrey.

John Young was a Freemason, and the house he completed in 1882 carries Masonic symbols worked into its decoration. The building is not open to the public, so these details are known from descriptions of the fabric rather than from a visit; the house remains a private residence on Johnston Street.

Entry is through the front gate area, from where visitors can explore the various floors and rooms. The structure has steep stairs and multiple levels that require reasonable physical mobility to navigate fully.

Gervase Davis, of the family that owned The Abbey for fifty years, believed the house was haunted and reported a lady in white seen occasionally. Ghost hunters with "ectoplasmic machines" investigated in the 1970s, and Francesca Davis thought cats sensed spirits, her hackles rising when one entered a room.